Ferdinand I of Aragon

Ferdinand I was elected King of Aragon by the Compromise of Caspe, a commission of nine representatives from Aragon, Catalonia, and Valencia. This resolved the succession crisis following the death of Martin I without a direct heir, bringing the Trastamara dynasty to the Aragonese throne.

Ferdinand I launched a military campaign to subdue the rebellious Sardinian nobles who had resisted Aragonese rule. The campaign successfully reasserted Aragonese control over the island, consolidating the Crown of Aragon's Mediterranean possessions.

Ferdinand I implemented administrative reforms in the Crown of Aragon, including the reorganization of the royal council and the standardization of tax collection. These reforms strengthened royal authority and improved the efficiency of governance across the diverse territories of Aragon.